caucase.wsgi: Missing "method" in path_entry_dict is a server issue.

It would be the sign of a inconsistency in the dispatcher dict.
Do not transform it into a user error (404).

caucase/wsgi.py

@@ -529,10 +529,8 @@ class Application(object):
           except KeyError:
             break
           del path_item_list[0]
-        try:
+        # If this raises, it means the outing dict is inconsistent.
         method_dict = path_entry_dict['method']
-        except KeyError:
-          raise NotFound
         request_method = environ['REQUEST_METHOD']
         try:
           action_dict = method_dict[request_method]